Malicious PDF — malware analysis report

Static analysis result for SHA-256 e378fea3412c7c58…

MALICIOUS

PDF

85.0 KB Created: 2021-09-01 17:46:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1b9319f14582ad78c6095b894bdfa9f6 SHA-1: 6959c78940bb27ba06e416ae607f8d8d2a009f83 SHA-256: e378fea3412c7c5833ab24c114c7047a0fa0c51f8d577969291293a1146cb978
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and multiple URLs pointing to compromised WordPress sites, indicating an attempt to host and distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The presence of PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports the use of compromised infrastructure for hosting malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078cccc5c88d---54215902294.pdf In PDF document text
    • https://dongcohonda.com/userfiles/file/48509441141.pdfIn PDF document text
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/paburemotitedojexukosu.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b76fde157a9---sevex.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbd8365a25---tovetoxedakawukirogija.pdfIn PDF document text
    • http://hourinkan.net/js/upload/files/fufuxoxodok.pdfIn PDF document text
    • http://rayanchem.com/d/files/95696218266.pdfIn PDF document text
    • http://vkts.se/userfiles/file/balopozekoravawax.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/xisibonakenubazora.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/72045091602.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/867293111fb17b19743d657da300a2b8/39210950476.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/nilam.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6eb987c1d---37913917335.pdfIn PDF document text
    • http://myexamadvisor.com/fck_uploads/files/20532562338.pdfIn PDF document text
    • http://hkwwta.org/userfiles/najafitaserisaza.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/zuworamenikom.pdfIn PDF document text
    • http://jhdljz.com/userfiles/file/1629033409.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/kigolizifuzofovebavigizi.pdfIn PDF document text
    • http://cachnhietcacham.vn/Images_upload/files/4066919995.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/49774511175.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/67455416958.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/3a632eab70c05536629dca6c8830e674/bokategonuxatirima.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=total+geography+class+9+icse+pdf+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D2 17488 bytes
SHA-256: 06c70934c7de6448e04b2bd8e7cef8e18ad27918c8560273401c9d3711eb61af
font_01_sfnt_off000113f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F0 11228 bytes
SHA-256: d7fec5e58a68f3cc0b4ee622cbbd03784362e03f7bb8eacc542de2e8e4b39d08
font_02_sfnt_off00012e25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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